We have telephony to talk to each other, messaging to dispatch mail or instant messages, browsing to read published content and search engines to locate content sites. However, current mobile networks do not provide the possibility for one application rich terminal to communicate with another in a peer-to-peer session beyond voice calls. Mobile telephony with the current technology has been hugely successful and shows that there is immense value in communicating with peers while being mobile, and with increasingly available smarter multimedia terminals the communication experience will be something more than just exchanging voice. Those multimedia terminals need IP multimedia networks. Hence, the Third Generation Partnership Project (3GPP) has developed a standard for SIP based IP multimedia service machinery known as 'The IMS (IP Multimedia Subsystem)' and this informative book explains everything you need to know about it ... Presents the architecture and functionality of logical elements of IMS and their interfaces providing detailed description of how elements are connected, what protocols are used and how they are used Explains how the optimisation and security of the mobile communication environment has been designed in the form of user authentication and authorisation based on mobile identities Illustrates how optimisation at the radio interface is achieved using specific rules at the user to network interface. This includes signalling compression mechanisms as well as security and policy control mechanisms, allowing radio loss and recovery detection Addresses important aspects from an operator's point of view while developing architecture such as charging framework, policy and service control Describes many services on top of IMS in detail, including voice, presence, messaging and conferencing. Written in a manner that allows readers to choose the level of knowledge and understanding they need to gain about the IMS, this volume will have instant appeal to a wide audience ranging from marketing managers, research and development engineers, network engineers, developers, test engineers to university students.

We have telephony to talk to each other, messaging to dispatch mailor instant messages, browsing to read published content and searchengines to locate content sites. However, current mobile networksdo not provide the possibility for one application rich terminal tocommunicate with another in a peer-to-peer session beyond voicecalls. Mobile telephony with the current technology has been hugelysuccessful and shows that there is immense value in communicatingwith peers while being mobile, and with increasingly availablesmarter multimedia terminals the communication experience will besomething more than just exchanging voice. Those multimediaterminals need IP multimedia networks. Hence, the Third GenerationPartnership Project (3GPP) has developed a standard for SIP basedIP multimedia service machinery known as 'The IMS (IP MultimediaSubsystem)' and this informative book explains everything you needto know about it.........* Presents the architecture and functionality of logical elementsof IMS and their interfaces providing detailed description of howelements are connected, what protocols are used and how they areused* Explains how the optimisation and security of the mobilecommunication environment has been designed in the form of userauthentication and authorisation based on mobile identities* Illustrates how optimisation at the radio interface is achievedusing specific rules at the user to network interface. Thisincludes signalling compression mechanisms as well as security andpolicy control mechanisms, allowing radio loss and recoverydetection* Addresses important aspects from an operator's point of viewwhile developing architecture such as charging framework, policyand service control* Describes many services on top of IMS in detail, includingvoice, presence, messaging and conferencing.Written in a manner that allows readers to choose the level ofknowledge and understanding they need to gain about the IMS, thisvolume will have instant appeal to a wide audience ranging frommarketing managers, research and development engineers, networkengineers, developers, test engineers to university students.

Foreword.Preface.Acknowledgements.List of Figures.List of Tables.PART I: ARCHITECTURE.1. Introduction.2. IP Multimedia Subsystem Architecture.3. IMS Concepts.PART II: DETAILED PROCEDURES.4. Introduction.5. An Example IMS Registration.6. An Example IMS Session.7. Routing of PSIs.PART III: PROTOCOLS.8. SIP.9. SDP.10. The Offer/Answer Model with SDP.11. RTP.12. DNS.13. GPRS.14. TLS.15. Diameter.16. MEGACO.17. COPS.18. IPsec.19. Signaling Compression.20. DHCPv6.21. XCAP.22. CPCP.PART IV: SERVICES.23. Presence.24. Messaging.25. Conferencing.References.Abbreviations.Index.